On rare occasions, a purchase may not be completed successfully due to connection errors or some other unexpected problems. In that situation, please try restarting the game, which will normally finalize any pending purchase.

If restarting the game doesn't help, please check your Purchase History to confirm whether you were charged:
https://support.apple.com/en-us/HT204088

If you were charged for a purchase but didn’t receive the purchased items, please contact Support through the ‘Contact Us’ button. Let us know which item you purchased, attach a screenshot of the receipt in the Purchase History and indicate the username of your Horus Heresy: Legions account. We will aim to answer and provide a solution within 24 hours.